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 Posted: Tue 18:52, 24 May 2011 Post subject: fred perry italia Two open -type compressor volume |
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| Two open-type compressor volumetric efficiency of a varying speed conditions Experimental Study
b4, ~ n +65 s2 (2) Form 5 type (2) the value of the coefficient of Tab. 5Valueofcoefficientinformula (2) Table 6, the volumetric efficiency of the experimental data (the working fluid for the R22) Tab. 6Experimentaldataofvolumetricefficiency (theworksubstanceisR22) Table 7 volumetric efficiency of the experimental data with equation (2) the results of the deviation (the working fluid for the R22) a 56 - Vol 30 No. 3 June 2009 the two opened a varying speed of compressor operating conditions Experimental study of volumetric efficiency under Vo1.30. , No3juHe20090.950.90O. 850.800.750.700.650.600.55O. 500.450.40500l0001500200025003000r / / (r / min) Figure 2 Changes of call-with s (working fluid is R134a) Fig. 2 knock curveas8changed (theworksubstanceisR134a) n / (r / min) Figure 3 with n changes (working fluid for the R22) Fig. 3 kei curveasnchanged (theworksubstanceisR22) from Figure 2, tl Figure 3 shows the rotational speed,mac cosmetics wholesale, with the pressure ratio increases,abercrombie outlet, the volumetric efficiency decreases; and when the speed is large (such as: n> 3000r/min),fred perry paris, the pressure volumetric efficiency than the impact of gradually weaker. The pressure ratio is constant,fred perry italia, the increase of volumetric efficiency with speed increases and then decreases,ed hardy mexico, there is an optimum speed or optimum speed range of the maximum volumetric efficiency; when the pressure is relatively small (eg: e <3), the speed volumetric efficiency of the obvious. Valve from the movement of valve point of view, it has not reduced or increased speed in the best movement of the time, but the best within a certain speed the movement of a deviation from the valve will affect the speed range The flow capacity. Therefore, the compressor volumetric efficiency increases as the speed increases and then decreases, at a maximum speed range. 3 Conclusion valve flow capacity is the process of change of compressor speed volumetric efficiency of the main factors, there is an optimum speed or speed range of the maximum volume efficiency. Experimental data obtained by the working fluid of the volumetric efficiency of the two fitting formulas and the calculated and experimental data, the average error of less than 5%, the fitting formula has a certain credibility. References [1】 beam Watchtower, Shi Lin. Performance simulation of automobile air conditioner compressor [J】. Tsinghua University (Natural Science), 1999,39 (11) :79-82. (LiangYue, ShiLin.Simulationofcompressorofautomobileaircondition [J]. JournalofTsinghuaUniversity, 1999,39 (11) :79-82.) [2】 Wang Jun, Wang Yiyi. Automotive air conditioning compressor gas Coefficient [J】. Fluid Machinery, 1994,22 (  :53-55. (Wangjun, WangYiyi.InvestigationontheVolumetricEfficiencyofAutomotiveAir-conditioningCompressor [J】. FulidMachinery, 1994,22 ( :53-55.) [3] KouryRNN, MachadoL, IsmailKAR. Numericalsimulationofavariablespeedrefrigerationsystem 【J]. InternationalJournalofRefrigeration ,2001,24:192-200. [4] P6rez-Sega ~ aCD, RigolaJ, S6riaM, eta1. Detailedthermodynamiccharacterizationofhermeticreciprocatingcompressors [J]. InternationalJournalofRefrigeration ,2005,28:579-593. A 57 -
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